Fix Linux app icon: Set DesktopFileName and add image debug logs

src/main.py

@@ -3,7 +3,7 @@ import sys
 import os
 import platform
 from PyQt6.QtWidgets import QApplication
-from PyQt6.QtGui import QIcon
+from PyQt6.QtGui import QIcon, QImageReader
 from teletext.ui import MainWindow
 
 def resource_path(relative_path):
@@ -24,6 +24,13 @@ def main():
         ctypes.windll.shell32.SetCurrentProcessExplicitAppUserModelID(myappid)
 
     app = QApplication(sys.argv)
+    app.setApplicationName("TeletextEditor")
+    app.setOrganizationName("DanielDybing")
+    app.setDesktopFileName("TeletextEditor") # Helps Linux DEs group windows
+    
+    # Debug Image Formats
+    supported_formats = [str(fmt, 'utf-8') for fmt in QImageReader.supportedImageFormats()]
+    print(f"DEBUG: Supported Image Formats: {supported_formats}")
 
     # Set App Icon
     icon_path = resource_path("app_icon.png")
@@ -33,6 +40,13 @@ def main():
         print("DEBUG: Icon file found.")
         app_icon = QIcon(icon_path)
         app.setWindowIcon(app_icon)
+        
+        # Verify icon loaded
+        if app_icon.isNull():
+             print("DEBUG: QIcon is null (failed to load image data)")
+        else:
+             print(f"DEBUG: QIcon loaded. Available sizes: {app_icon.availableSizes()}")
+
     else:
         print("DEBUG: Icon file NOT found.")